just had a couple of these added to my route also...sounds like you got lucky and they left you the HHU behind to see faults.
Mine do not have microswitches, BR2 failed and elev kept running with brake dropped and set off smokes. I would have thought drive would have faulted out 1st.

Believe it or not you can get tech support on these from MCE but only until June 1st. and that's "the end of life" support. They bought O'Thompson somewhere back around 2005.

Your situation...if brake sw parameter is disabled not sure why you would be getting brake not lifting faults and open safe circuit while running could be anything...door locks?